Module operator 

ECMAScript operator enums, factored out of the expression variants.

Enums

AssignmentOperator

Assignment operators. = is plain assignment; all others are compound (e.g. += is “add and assign”).

BinaryOperator

Binary operators per ECMA-262 (excluding &&, ||, ?? which are in LogicalOperator).

LogicalOperator

Logical operators with short-circuit semantics.

UnaryOperator

Unary prefix operators.

UpdateOperator

++ and --. The prefix: bool field on Expression::Update distinguishes ++x from x++.